Index: lib/CodeGen/CGDebugInfo.h =================================================================== --- lib/CodeGen/CGDebugInfo.h +++ lib/CodeGen/CGDebugInfo.h @@ -395,6 +395,9 @@ llvm::Value *AI, CGBuilderTy &Builder); + /// Emit call to \c llvm.dbg.label for an label. + void EmitLabel(const LabelDecl *D, CGBuilderTy &Builder); + /// Emit call to \c llvm.dbg.declare for an imported variable /// declaration in a block. void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable, Index: lib/CodeGen/CGDebugInfo.cpp =================================================================== --- lib/CodeGen/CGDebugInfo.cpp +++ lib/CodeGen/CGDebugInfo.cpp @@ -3640,6 +3640,33 @@ return EmitDeclare(VD, Storage, llvm::None, Builder); } +void CGDebugInfo::EmitLabel(const LabelDecl *D, + CGBuilderTy &Builder) { + assert(DebugKind >= codegenoptions::LimitedDebugInfo); + assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!"); + + if (D->hasAttr()) + return; + + auto *Scope = cast(LexicalBlockStack.back()); + llvm::DIFile *Unit = getOrCreateFile(D->getLocation()); + + // Get location information. + unsigned Line = getLineNumber(D->getLocation()); + unsigned Column = getColumnNumber(D->getLocation()); + + StringRef Name = D->getName(); + + // Create the descriptor for the label. + auto *L = DBuilder.createLabel(Scope, Name, Unit, Line, + CGM.getLangOpts().Optimize); + + // Insert an llvm.dbg.label into the current block. + DBuilder.insertLabel(L, + llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt), + Builder.GetInsertBlock()); +} + llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy, llvm::DIType *Ty) { llvm::DIType *CachedTy = getTypeOrNull(QualTy); Index: lib/CodeGen/CGStmt.cpp =================================================================== --- lib/CodeGen/CGStmt.cpp +++ lib/CodeGen/CGStmt.cpp @@ -531,6 +531,18 @@ } EmitBlock(Dest.getBlock()); + + // Emit debug info for the label only if it's reachable. + if (HaveInsertPoint()) { + if (CGDebugInfo *DI = getDebugInfo()) { + if (CGM.getCodeGenOpts().getDebugInfo() >= + codegenoptions::LimitedDebugInfo) { + DI->setLocation(D->getLocation()); + DI->EmitLabel(D, Builder); + } + } + } + incrementProfileCounter(D->getStmt()); } Index: test/CodeGen/debug-label-inline.c =================================================================== --- /dev/null +++ test/CodeGen/debug-label-inline.c @@ -0,0 +1,28 @@ +// This test will test the correctness of generating DILabel and +// llvm.dbg.label when the label is in inlined functions. +// +// RUN: %clang_cc1 -O2 %s -o - -emit-llvm -debug-info-kind=limited | FileCheck %s +inline int f1(int a, int b) { + int sum; + +top: + sum = a + b; + return sum; +} + +extern int ga, gb; + +int f2(void) { + int result; + + result = f1(ga, gb); + // CHECK: call void @llvm.dbg.label(metadata [[LABEL_METADATA:!.*]]), !dbg [[LABEL_LOCATION:!.*]] + + return result; +} + +// CHECK: distinct !DISubprogram(name: "f1", {{.*}}, labels: [[LABELS:!.*]]) +// CHECK: [[LABELS]] = !{[[LABEL_METADATA]]} +// CHECK: [[LABEL_METADATA]] = !DILabel({{.*}}, name: "top", {{.*}}, line: 8) +// CHECK: [[INLINEDAT:!.*]] = distinct !DILocation(line: 18, +// CHECK: [[LABEL_LOCATION]] = !DILocation(line: 8, {{.*}}, inlinedAt: [[INLINEDAT]]) Index: test/CodeGen/debug-label.c =================================================================== --- /dev/null +++ test/CodeGen/debug-label.c @@ -0,0 +1,16 @@ +// This test will test the correstness of generating DILabel and +// llvm.dbg.label for labels. +// +// RUN: %clang_cc1 -emit-llvm %s -o - -emit-llvm -debug-info-kind=limited | FileCheck %s + +int f1(int a, int b) { + int sum; + +top: + // CHECK: call void @llvm.dbg.label(metadata [[LABEL_METADATA:!.*]]), !dbg [[LABEL_LOCATION:!.*]] + sum = a + b; + return sum; +} + +// CHECK: [[LABEL_METADATA]] = !DILabel({{.*}}, name: "top", {{.*}}, line: 9) +// CHECK: [[LABEL_LOCATION]] = !DILocation(line: 9,